The Three Doctors – Episode Guide

A weather balloon carrying a device for cosmic ray research comes down in the Minsbridge Wild Life Sanctuary and is found by the local gamekeeper, Mr Ollis (Laurie Webb). Its’ owner, Doctor Tyler (Rex Robinson), is summoned by Ollis’ wife (Patricia Prior) but Ollis vanishes from beside the device before he arrives. Tyler contacts UNIT and takes the device into their HQ. He was going to contact them anyway in view of the recent results of his tests which show an unknown type of cosmic lightning, directed at the Earth. The Doctor is intrigued and goes to see the spot where the balloon came down.